TM-9-2320-272-23-1
TRUCK, 5-TON, 6X6, M939, M939A1, AND M939A2 SERIES TRUCKS (DIESEL)
TECHNICAL MANUAL; FIELD MAINTENANCE MANUAL; VOLUME 1 OF 5
SEPTEMBER 2012
TM-9-2320-272-23-1 - Page 934 of 1313
LOW AIR PRESSURE WARNING BUZZER WILL NOT SHUT OFF (AIR PRESSURE GAUGES AT NORMAL
SYSTEM PRESSURE) - Continued
c.
Visually inspect wire 578A for frayed or damaged condition. Refer to point to point schematic.
d.
Disconnect wire 578A from primary and secondary low air pressure switch.
e.
Place battery switch to ON position.
f.
Place start switch to RUN position.
g.
Make sure air gauges read at least 90 psi.
NOTE
If alarm is silenced when jumper wire is installed, wire 578A is faulty.
h.
Connect jumper wire from open contact on primary low air pressure switch to open contact on secondary
low air pressure switch.
CONDITION/INDICATION
IS WIRE 578A IN GOOD CONDITION?
DECISION
NO - Repair or replace wire 578A (Volume 3, WP
0352). Go to Step (6) to verify problem is solved.
NO - Go to Step (5).
TM 9-2320-272-23-1
0110
0110-9
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